Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 305: | \[{7^{305}-1\over6}\] | 367 × 2801 × 4759 × 177237331 × 16199725471<11> × 1362349539551924951<19> × 1914662449813727660680530326064591907<37> × 5554678022917560417664065958900541081<37> × 465750747325292359561905512925902764405054129988774725490187759651363436086466070882756044177876648003275728549515546676968607859878786401<138> |